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Chapter 3: Q 1. (page 92)

What kind of sugars are these, aldose or ketose?

Short Answer

Expert verified
  • Glucose and galactose are aldoses.
  • Fructose is a ketose.

Step by step solution

01

Introduction

Monosaccharides

  • Simple sugars are known as monosaccharides.
  • The suffix -ose is found at the end of most monosaccharide names.
  • It could be aldose or ketose.
  • They can be trioses, pentoses, or hexoses, depending on the number of carbons in the sugar.
  • Example - glucose, galactose, fructose.
02

Explanation

Aldose

  • If the monosaccharide has an aldehyde group (R-CHO), it is an aldose.
  • Aldoses have a carbonyl group at the end of the carbon chain.
  • Glucose andgalactose contain an aldehyde group, so they are aldoses.

Ketose

  • If the monosaccharide has a ketone group ( RC(=O)R'), it is a ketose.

  • ketoses have a carbonyl group in the middle of the carbon chain.

  • Fructose contains a ketone group, so it is a ketose.

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